Official OCR Physics A G481 24th May June 2016

Thanks but Micrometer would be used for thickness rather than height ?

very last question, you cannot arrive at the conclusion that it doubles, though you could say that the cables would extend.

yeah, to multiply by width for area right?

Thanks but Micrometer would be used for thickness rather than height ?

The extension decreases. Force increases so stress increases so YM increases so strain decreases so extension decreases. Was this right?

Quite easy.

Some of the stuff I got that I can remember: could be incorrect

1.)Blood accelerates at 0.149
2.) Drag affected by speed and temperature and Drag was 545N
3.) Cars jumped over was 23.3333 so 23
4.) forces X and Y were equal but Not opposite so not a couple.
When the cyclist leans forward, perpendicular distances increased, moment is same so force on X decreases.
5.) stopping distance was 90m
6.) -same force caused half the extension so in parallel the value of k is twice. k=f/x
-Load masses till strip fractures, force = number of masses * 0.1 * 9.81. Measure height with micrometer. CS Area = height * width. Stress = Force/area
7.) extension was 23.3mm
Resultant force upwards means tension increased so due to x = F/k where Force constant is same the extension increases.

Thought it was much easier than last year.
Maybe 46 for A
51 for 90%
And 56 for 100%. Idk

I needed to claw back ums because I got a low b last year on this

The extension decreases. Force increases so stress increases so YM increases so strain decreases so extension decreases. Was this right?

I did exactly the same I got 93 mm because I stupidly multiplied all the other values by 4 and not divided the weight by 4. To be honest I wasn't sure what to do for that question so I am hoping I get 2 marks. 1 for converting m to mm and 1 for rearranging the equation??

Quite easy.

Some of the stuff I got that I can remember: could be incorrect

1.)Blood accelerates at 0.149
2.) Drag affected by speed and temperature and Drag was 545N
3.) Cars jumped over was 23.3333 so 23
4.) forces X and Y were equal but Not opposite so not a couple.
When the cyclist leans forward, perpendicular distances increased, moment is same so force on X decreases.
5.) stopping distance was 90m
6.) -same force caused half the extension so in parallel the value of k is twice. k=f/x
-Load masses till strip fractures, force = number of masses * 0.1 * 9.81. Measure height with micrometer. CS Area = height * width. Stress = Force/area
7.) extension was 23.3mm
Resultant force upwards means tension increased so due to x = F/k where Force constant is same the extension increases.

Thought it was much easier than last year.
Maybe 46 for A
51 for 90%
And 56 for 100%. Idk

I needed to claw back ums because I got a low b last year on this

What did you guys draw for the Force time graph on the drag question?

Anyone want to work on a google docs to create an unofficial mark scheme??

That sounds like a good answer to me

so you're saying if you sat on a air-filled seats, it would be no different to sitting on bricks?